61, and 62 (Fig- 6). A conservative estimate of the minimum volume of 

 the material, based on the minimum area encompassed by lines connecting 

 the cores sites CFig- ^> area Bl) and a minimum depth, based on the average 

 depth (13.8 feet, 4.2 meters) sampled in the cores is ll'.S million cubic 

 yards (8.2 million cubic meters). Since much of the shoal mass was not 

 sampled, other areas as suitable for borrow as area Bl may exist closer to 

 shore. 



c. Borrow Area C . This site comprises a large rectangular area 

 within the boundaries of a prominent filled river channel (Figs. 2 and 7), 

 which trends east- southeast from the vicinity of Kure Beach. Cores taken 

 within this area contain biogenic calcareousi sediment and rock with, the 

 upper 5 to 15 feet (1.5 to 4.6 meters) in a loose granular state. It is 

 unclear whether the unconsolidated material represents a naturally un- 

 consolidated facies or the product of disaggregation of poorly consolidated 

 material during the coring process. In either event, it seems probable 

 that large quantities of dredgable granular sediment are available from 

 the area. Since well-consolidated ledges occur throughout the area, 

 detailed surveys with a dense net of probe or drill holes would be re- 

 quired to further delineate the recoverable material. An isopach map 



of the channel area and similar channels to the north is shown in Figure 

 7. The volume of fill within the channel area, as delineated on seismic 

 reflection profiles, is approximately 1.2 billion cubic yards (0.92 

 billion cubic meter). The nature of the fill is unknown below a depth 

 of 20 feet (6.1 meters), the maximum penetration of cores. The calcareous 

 facies fills the channel to this depth. Using 10 feet as an average 

 depth for this material, the approximate volume in the channel area is 

 202 million cubic yards (154 million cubic meters) . 



The suitability of the calcareous granular sediment found in borrow 

 area C for beach fill is questionable. Its coarseness and abundance of 

 granule- and pebble-size fragments might make it undesirable on a recrea- 

 tional beach. In addition, being almost entirely composed of calcium 

 carbonate, it is chemically and mechanically less durable than quartz and 

 could degrade rapidly or form cemented crusts when placed in the beach 

 environment. It would probably be quite suitable for purely protective 

 beaches or as core material for beaches and armored structures. 



Three similar channels north of borrow area C are shown in Figure 7. 

 They appear to contain the same calcareous material as the southern 

 channel but there are insufficient core data for further de.finition. 



d. Borrow Area D . This borrow area is a previously used dredge spoil 

 disposal area located 3 nautical miles (5.6 kilometers) southwest of Beau- 

 fort Inlet (Fig. 4). The borrow consists of a low mound, apparently 

 composed of material dredged from the entrance channel of Beaufort Inlet. 

 Core 94 in the central part of the mound contains 8 feet (2.4 meters) of 

 clean, medium to coarse quartz sand overlying fine, shelly sand. Mean 

 diameters of the quartz sand range from 0.266 to 0.379 millimeter (1.91 



to 1.40 phi). The zero isopach reflector in Figure 8 is at about the level 



